subclassing.py

from orderbook import OrderBook

class ElectraOrderBook(OrderBook):
  
  def get_executed_trades(self):
    trades_list=[]
    #...
    # do some magic with self.idontknowwhat variables, put them into the trades_list...
    #...
    return trades_list
  
##### Usage later:

lob=ElectraOrderBook()
print(lob.get_executed_trades())